public void dispose() {
super.dispose();
undoAction.removePropertyChangeListener(this);
redoAction.removePropertyChangeListener(this);
if (workbench != null) {
workbench.removePartListener(this);
}
}
public void init(IActionBars bars) {
super.init(bars);
IMenuManager menuMgr = bars.getMenuManager();
IMenuManager editMenu = menuMgr.findMenuUsingPath(IWorkbenchActionConstants.M_EDIT);
if (editMenu != null) {
IContributionItem[] items = editMenu.getItems();
undoAction = ((ActionContributionItem) items[0]).getAction();
redoAction = ((ActionContributionItem) items[1]).getAction();
undoAction.addPropertyChangeListener(this);
redoAction.addPropertyChangeListener(this);
}
}
public void setActiveEditor(IEditorPart targetEditor) {
super.setActiveEditor(targetEditor);
workbench = targetEditor.getSite().getWorkbenchWindow().getActivePage();
workbench.addPartListener(this);
targetEditor.addPropertyListener(this);
}